Packing for doorcheck plungers



D ec- 20, 1932- s. w. c. F11-Ts PACKING FOR DOORCHEGK PLUNGERS Filed Maron 17, 1931 A TTORNE YS.

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Patented Dec. 20, 1932 UNITED STATES PATENT oFFIcE SILAS W. C. FITTS, 0F ALAMEDA, CALIFORNIA, ASSIGNOR T0 THE CONDOR COMPANY,

SAN FRANCISCO, (LAIIIFOIRNIA,A A CORPORATIONOF NEVADA PACKING Fon nooRcHEox PLUNGERS Application med March 17, 1931,. semi 110.523,268.

The present invention relates to a packing structure for movable rods, shafts and the like, and is especially adaptedfor packing for the plunger of a door check of the type shown and described in United States Letters Patent 1,7 36,175.

The principal object of the present invention is to provide packing which is selr` tightening, to a certain degree at least, to obviate the necessity for frequent adjustment. A second object is to provide means in a door check of the type described to adjust the packing easily and quickly from the outside. These and other objects and advantaves of the invention will be set forth more fully in the following specification, which should be read with the understanding that the form, construction and arrangement of the several parts may be varied, within the limits of the claims hereto appended, without Itis also to be understood that the invention may have other uses than that specifically described herein.

Reference will be made to the accompanying drawing in which 1 ig. 1 is a part sectional side view of a door check ot the type disclosed in said Patent No. 1,736,175, showing my improved packing structure in section. e

Fig. 2 is a plan view of the door check showing its position relative to the door, the hinge, and the door frame, the latter being shown in section.

Fig. 3 is anenlarged rear elevation of the spring ring incorporated in the packing for keeping it tight. j

In the drawing, the reference numeral 1 designates the body of a door check of the type disclosed in the above mentioned patent. It is unnecessary herein to show and describe the details of construction of said door check, except to note that the body 1 has a tain a supply of checking fluid, which, upon the outward movement of the piston 3, is

freely drawn into the barrel 2 through a suitable check valve indicated at 10, and, upon A spring 8 moves the piston outwardly.

the inward movement of said piston, is forced through a restricted by-pass indicatedkat-ll, thereby providing the` checking resistance for the closing of the door. j

Door checks of this type are preferably and usually positioned at one of the door hinges in order to concentrate the strains set up by the checking action. One plate 12 of the hinge preferably forms a face plate and mounting for the check body 1, the other plate 12 carrying the presser member 6.

, The check body 1 is secured to the hinge plate ,12 ,byk screws 1,3, and said hinge plate is securedto the door frame by screws 14.V

departing from the spirit ofthe invention.

imate sectional form shown in Fig. 1,`a bushing 18, and an annular nut 19 for tightenin the flexible ring 17 between said bushing an the iixed rin`g` 15. A split ring 20 of spring steel or other suitable metal surrounds the tubularv portion of the iiexible ring 17. Its inner face is tapered, as shown at 21, and its outer rear corner is preferably formed' with a small bevel 22. The spring ring 20 rests against the fixed ring 15, and is of such a diameterthat it compresses the tubular portion or neck of the flexible ring 17 tightly about the piston stem4. j

The parts are shown in the drawings in their extended or loosev positions. In order to tighten lthe packing, the nut 19 is screwedv inwardly by means of a suitablejspanner wrench engaging' its notches 23. The inward `movement of the bushing 18 compresses the tubular neck of the lexible ring 17 into the annular space between the stem 4 .andthe split ring 20, thereby expanding said Vsplit ring. As the flexible ring 17 wears, due to the rubbing of the stem 4 against it, the split ringy 20 contracts, thereby keeping the tubular neck portion of said flexible ring 17 tightly clamped about the stem 4. When the Wea-r has proceeded to such a point that the split ring 2O no longer contracts, a further tightening of the nut 19 forces an additional portion ,of the flexible ring 17 into the tapered interior of said split ring, expanding the latter and enabling it to again exert its contracting effect. 10

The hinge or face plate 12 is provided With an aperture 24 of sufficient size to permit the nut 19 to extend through it. The nut is therefore accessible at all times for adjustment. This is particularly advantageous iii cases Where the face plate of the check body -is a part of the hinge, as shown in the drawing, because it obviates the necessity for removing the hinge plate iii order to reach the adjusting nut for tightening the packing.

The split spring ring 2() is especially desirable in the above described application of my packing, because there is n0 fluid pressure upon the flexible ring 17 from the inside of the barrel, the forward end of said barrel being connected with the reservoir 9 by a vent passage 25. `Interior fluid pressure cannot therefore be relied upon to compress the flexible ring 17 about the stem 4.

I claim 1. A packing structure for apparatus of "the described type having a cylinder, a face plate at one end thereof, and a plunger operable in said cylinder and projecting 'through said face plate, comprising a ring fixed in said cylinder and surrounding said plunger, a movable bushing spaced from said fixed ring, a. flexible packing ring between said bushing and said fixed ring, said flexible ring having a tubular portion, a spring ring having one end face seated against said fixed ring and surrounding said tubular portion zfor contracting it about the plunger, and a nut for forcing said bushing against said flexible ring, said nut extending through said face plate to an accessible position.

-2. .A packing structure for movable rods,

shafts and the like comprising a flexible packing ring having a tubular portion surrounding the rod, a fixed-member surrounding the .rod at one end of said packing ring,.a resilient expansible and contractible ring surrounding the tubular portion of said packing ring, said expansible and contractible ring having one end face abutting against said fixed member and having its interior flaring outwardly from said abutting end, and an Aadjustable member bearing against the other end of said flexible packing ring for forcing it endwise into said expansible andcontractible ring.

In testimony whereof I have signed my name to this specification.

siLAs W. p o. rirrs. 

